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Subungual squamous cell carcinoma (sSCC) is the most frequent malignant tumor of the nail unit. When suspecting sSCC, accurate diagnosis is supported by nail biopsy. Depth of invasion and histopathologic signs of human papillomavirus (HPV) infection are related to an unfavorable prognosis. In this case, it is necessary to rule out bone invasion by radiography or MRI, and in case of doubt, amputation is indicated. We present 2 cases of sSCC with a confirmatory biopsy of sSCC with HPV and invasion; in both cases, MRI was difficult to dis